hi.
Arrayed waveguide gratings are mainly applied in optical fiber communication systems, in particular in those based on multi-channel transmission with wavelength division multiplexing (WDM)……..where individual wavelength channels must be combined or separated e-g TWDM PONs etc…
However i would like to mention that while using AWG for my implementation , my performance was not that gud but using WDM mux/demux separately my performance was better.
Thanks and regards